How to initialize IEnumerable that be empty and allow to Concat to it?

It seams all you want to do is filter your context.Books by some criteria.

IEnumerable<Book> books = context.Books.Where(b => someConditions);

If you still need the empty IEnumerable you can just call Enumerable.Empty():

IEnumerable<Book> books = Enumerable.Empty<Book>();

 

https://stackoverflow.com/questions/17831011/how-to-initialize-ienumerableobject-that-be-empty-and-allow-to-concat-to-it

 

 

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